a form of prostitution in japan and other asian countries. the customer pays and is taken into a bathing room. the prostitute washes the customer and lays him/her on a inflatable matress. the prostitute contnues by oiling her whole body and laying on top of the customer and giving a "body massage" followed by a blowjob and a good fucking to the customers liking. afterwards, the customer is washed down again, dried and sent on his/her way.
these brothels are also known as "soap-lands"

dude, last night we went down to the soapies and blew our entire freaking paycheck!! totally worth it though.

The act of performing cunnilingus or analingus on your partner while taking a shower before the other person has rinsed the soap off or while they are soaping themselves up. The soap runs down their body and into your waiting mouth, hence a "soapie".

My girlfriend and i were talking a shower and i couldn't help myself and gave her a soapie